Furnace



FIG. 1 is a front perspective view of the furnace in the presentinvention.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a top view thereof.

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof.

The broken lines illustrate portions of the furnace that form no part ofthe claimed design.

CLAIM The ornamental design for a furnace, substantially as shown anddescribed.